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**outlook064** · 04-06-2011, 09:47 AM

Producing Video clip Available Intent
A primer on the web accessibility criteria as they relate to video clip and generating your videos compliant with individuals requirements.
Introduction
Web accessibility refers for the practice of creating web-sites usable for all men and women,Windows 7 Pro Product Key, in particular for those with disabilities, making sure that all of us has equal entry to all web site subject material. The planet Huge World wide web consortium (W3C) has established a set of suggestions identified as Web Articles Accessibility Pointers, which attempts to provide a standardized and definitive set of principles for methods to build accessible on the net material.
Contents Accessibility Tips Accessibility Illustration Example Codes Different Ways Authoring Equipment Accessibility Pointers
Let's first have a look at accessibility for the physically disabled. The W3C consortium has developed a set of suggestions recognised as the web Subject matter Accessibility Suggestions (WCAG 1.0).Introduced in 1999,Windows 7 Starter Key, these recommendations have since been widely adopted. A second version (WCAG 2.0) was published in December of 2008. Here's an overview of the current expectations:
WCAG 1.0 WCAG 2.0 importance of the subject material A AA AAA A AA AAA (closed) captions X X X X* X X (closed) audio description X X X X* X X full text alternate X* X sign language X
* Choose at least one of the three options.
As you can see, according for the W3C, captions should be available for every published video clip. Captions are defined as "synchronized text equivalents of audio information in the same language as the audio, conveying not only speech subject matter, but also non-speech information such as sound effects, music, laughter, and speaker identification and location." Closed captions must possess the option of being turned on or off at will. Non-closed (open) captions are printed about the video clip itself
The second important element is audio description, which makes video clip accessible for the visually impaired. It provides information about movements or actions that are important to comprehending the subject material and cannot be understood from the audio information alone. WCAG 1.0 always requires an audio description, while WCAG 2.0 permits you to replace it with a text description, but only for your least important subject material.
In addition towards the requirements in the table above, two other generally accepted principles of thumb are:
Don't enable autoplay (audiovideo should be user-activated). Don't substitute HTML or text files for captions and audio descriptions
Note that the WCAG 1.0 contains less requirements for live video clip, decorative video and audio. Eric Velleman from Accessibility.nl has written a detailed document on this topic, which is also available in Dutch.
Accessibility Illustration
A properly accessible video should contain captions and an audio description. Let's see how this works in a real-life example. The video clip below shows an excerpt from ITV's Coronation Street, as shown on the RNIB website:
playpause the video muteunmute the video rewind and stop the video clip
The video is played back in the JW Player for Flash. It's one of the few players that can display both closed captions and a closed audio description. Since it is built in Adobe's Flash, 95-99% of your visitors will be able to watch it.
Other accessibility features of this player are its keyboard controls (using the TAB and SPACE controls), its screen reader-labeled buttons and the full-screen button. Also, immediately above the player,Windows 7 Home Basic, hidden controls allow screen reader users to control the basic functionality of the player (Play Mute Stop).
This instance uses the SWFObject JavaScript to detect if your visitors have the right Flash plugin (and JavaScript) installed. If so, the player is shown. If not, the player falls back to show an image linking to a downloadable video clip file. You can see a demonstration of how this works by turning off your browser’s JavaScript and reloading this page. Again, both the image and link have a text label for screen readers.
Instance Codes
Here's the actual code used for the accessibility instance above.
 <a href="corrie.mp4" title="download the MP4 excerpt"> <img src="corrie.jpg" width="470" height="300" alt="a small excerpt from ITV's Coronation Street" > <a>
 <script type="textjavascript"> var sa = new SWFObject('player.swf','mpl','470','300','9'); sa.addParam("allowfullscreen","true"); sa.addParam("allowscriptaccess","always"); sa.addParam("seamlesstabbing","true"); sa.addParam("flashvars","file=uploadcorrie.flv&ima ge=uploadcorrie.jpg&captions.file=uploadcorrie.xml &audiodescription.file=uploadcorrie.mp3&plugins=ca ptions-1,audiodescription-1"); sa.write('video');
<script>
And this is what the TimedText XML file looks like:
<tt xmlns=" <body> <div xml:id="captions"> - Nothing is going on. You liar! Are you? Violet, please! - I am not your babe! You stupid cow, look what you gone and done now, ay. Vi,Microsoft Office 2010 Home And Business, please. - Leave me alone! - We need to talk. - Jason, are you deaf?! What's going on? Get out there and try to salvage this! <div> <body>
<tt>
This setup can be tweaked a bit to further enhance the quality. Some methods are listed below:
Use the captions.fontsize FlashVar to change the size of the captions font. (default = 14). Set the captions.back FlashVar to "true" to show a semitransparent backdrop that makes the captions more readable. Set the captions.state FlashVar to "false" to turn off the captions by default. Use the audiodescription.volume FlashVars to change the volume of the audio description (default = 90). Set the audiodescription.state FlashVar to "false" to turn off audio descriptions by default. Use a full JavaScript API to extend the hidden controls above the player. Use the upcoming Accessibility plugin to toggle on off audio and captions. Solution Approaches
Besides the JW Player for Flash, Windows Media and QuickTime both support closed captions, with SAMI format and QTtext 3GPP Text support, respectively. However, neither of these players support a closed audio description.
Note that the downloadable video file is an MP4. This is a high-quality format, which is very popular among mobile devices such as iPods iPhones, the PSP and many smart phones. The MP4 format, though, isn't very useful if your target audience has older browsers or devices. It's fairly new and isn't supported by the default Windows installations. If your goal is to maximize reach, it’s best to encode any download as an MPG; its quality relative to file size is poor, but it’s able to play on just about everything. If you want to maximize accessibility even further, you can always hard code the captions and audio description into the video.
Authoring Tools
There's a whole range of applications that can transcode your original video files into any format you’d like (e.g. FLV, MP4,microsoft Office 2010 keygen, WMV, MPG). There’s a helpful list of links to some interesting applications in the web Video Compression guide.
Unfortunately, there are only few applications available for creating closed captions:
NCAM's magPIE (free, also for MAC) URUSoft's Subtitle Workshop (free) Manitu Group's Captionate ($60) VideoToolShed's SubBits subtitler ($199)
Both magPIE and Subtitle Workshop support the export of captions to W3C's TimedText (Flash), SMILQTtext (Quicktime) and ASXSAMI (Windows Media). For Subtitle Workshop you need the TimedText output script (available from Naomi Spirit). Captionate, (intended for FLV video clip) can only export to W3C's TimedText, though it can also save captions as metadata.
Only magPIE has support for recording audio descriptions, but it’s somewhat limited. You cannot record to MP3 and cannot merge recorded samples or integrate them with a video. For now, a full-fledged audiovideo suite, like Adobe's Premiere Audition or Apple's iMovieGarageBand, is needed for creating closed audio descriptions.